body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #f0f2f5;
    margin: 0;
}

h1, h2 {
    color: #333;
}

#qrcode {
    margin: 20px;
    padding: 10px;
    background: white;
    border: 1px solid #ccc;
    display: inline-block;
}

#qrcode img {
    display: block;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
    margin-bottom: 20px;
}

button:hover {
    background-color: #0056b3;
}

#attendance-list {
    list-style-type: none;
    padding: 0;
    width: 300px;
}

#attendance-list li {
    background: white;
    margin: 5px 0;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

#reader {
    width: 500px;
    border: 1px solid #ccc;
    background: #eee;
}

#result {
    margin-top: 20px;
    font-size: 18px;
    color: green;
}

a {
    margin-top: 20px;
    color: #007bff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}